math,correction ,

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can someone correct these for me please...
Remove the parentheses.
-(3x+5y)

My answer: -3x-5y

Find the value of the polynomial

-x^2+3x-1 when x=4

My answer: -5

multiply. 10x(-4x-7)

my answer: -40x^2-70x

all correct.

awsome.....thank you...i just want to make sure....

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